Hi Rose, i can quite happily give you my opinion, and also you are welcome to have a look at my diary which is a sticky on Weight Loss Diary.
Does your sister in Law have the same amount to lose as you???
Ok, I was a WW starter, re starter for years and got into a vicious circle with it. Weight off and weight on again.
The problem i found with WW was that the end was never in sight, standing on the scales at 16 st and them writing 10st goal on my card seemed so unacheivable.
Two things I liked most about CD,
1, Taking food out the equation, I didnt have to think about food, points, syn, calories. I knew what i had to have and when.
2, Fast weight loss, yes you have lost 5lbs this week and your sister lost 9lbs, however will she lose 5lbs next week, 4lbs the week after, and a loss of a stone a month after all?? If you look at the overall benefits then CD out weighs the benefits, imo!
Many people dont understand CD, to them its dangerous, its a fad, and all you can do is give them the facts, you get 100% of all nutrients, its the fastest and safest way to lose weight.
I am a true CD convert, it worked for me, 5st in 4 months or so, and WW wouldnt come close.